Pilatus planes must update software that gave false stall warnings

The US aviation regulator is forcing a software update and manual change for certain Pilatus PC-12/47E airplanes. This fixes a bug where the plane's stall warning system would turn on when it should not.

Aircraft manufacturers must fix safety flaws when regulators find them. This rule forces Pilatus to update software on specific planes. It prevents pilots from getting false warnings about stalls.